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  • A: Endothelium which is simple squamous epithelium lines the inside of the entire circulatory system.
    B: Tunica media is composed of smooth muscle. There is more smooth muscle in the arteries than in the vesins
    C: Tunica Adventitia is composed of connective tissue
  • A: The endothelium is the very thin layer of simple squamous on top of the thin black line which is the internal elastic lamina

    B: The tunica media is smooth muscle and is found just beneath the thin black layer that is the internal elastic lamina